Navbar is not re-rendering on router location change - reactjs

Question

I want to display userName and changed the button text to 'logout' from 'login' in Navbar(nav component) when user is logged in. I tired to re-render the Nav Component by pushing the router history location to homepage on user logged in.
this.props.history.push('/')
Then User can successfully log in, user data is saved in localStorage and the router location is changed. data is saved in localStorage, but the component is not re-rendering.
Here is what I have tried.
tried to downgrade 'connected-react-router' to 'v6.0.0' but it threw me some errors. so put it back to the latest version '^6.4.0'.
tried to add Navbar code in App.js which is the parents component.
But the app.js itself is not re-rendering either on user logged in.
app.js
import React from 'react';
import { connect } from 'react-redux';
/* --- Components --- */
import Nav from './src/components/nav';
import Loader from './src/shared/loader';
import './styles/main.scss';
const FlashMessagesContainer = Loader({
loader: () =>
import('./src/shared/flassMessagesContainer' /* webpackChunkName: 'FlashMessagesContainer' */),
});
const App = (props, { isOnModal }) => (
<div id="app">
<Nav />
{!isOnModal && (
<div className="flex justify-center">
<FlashMessagesContainer />
</div>
)}
{props.children}
</div>
);
const mapPropsToState = state => ({
isOnModal: state.modal.show,
});
export default connect(
mapPropsToState,
null,
)(App);
nav.js
import React, { Component } from 'react';
import { connect } from 'react-redux';
import { Link, withRouter } from 'react-router-dom';
/* --- Components --- */
import {
isLoggedIn,
getCompanyName,
clearLocalStorage,
} from '../../localStorage';
class Nav extends Component {
handleUserLogout = async ev => {
ev.preventDefault();
await clearLocalStorage();
return this.props.history.push('/login');
};
render() {
return (
<div className="nav">
{isLoggedIn() ? (
<div className="flex">
<p className="mr3 mt2">
안녕하세요. <span className="b">{getCompanyName()}</span>
 님,
</p>
<button
type="button"
className="login-btn td-none c-text br f-mini"
onClick={this.handleUserLogout}
>
로그아웃
</button>
</div>
) : (
<Link className="login-btn td-none c-text br f-mini" to="/login">
로그인
</Link>
)}
</div>
);
}
}
export default withRouter(Nav);
localStorage.js
export const getToken = () => localStorage.token;
export const getCompanyName = () => localStorage.companyName;
export const isLoggedIn = () => !!localStorage.token;
export const saveUserNameAndToken = userData => {
localStorage.setItem('token', userData.token);
localStorage.setItem('companyName', userData.companyName);
};
export const clearLocalStorage = () => localStorage.clear();
index.js
import React from 'react';
import { render } from 'react-dom';
import { Provider } from 'react-redux';
import { ConnectedRouter as Router } from 'connected-react-router';
import { MuiThemeProvider, createMuiTheme } from '#material-ui/core/styles';
import configureStore, { history } from './store';
import Routes from './routes';
const theme = createMuiTheme({
...
});
const store = configureStore();
const root = document.createElement('div');
document.body.appendChild(root);
render(
<Provider store={store}>
<MuiThemeProvider theme={theme}>
<Router history={history}>
<Routes />
</Router>
</MuiThemeProvider>
</Provider>,
root,
);
routes.js
import React from 'react';
import { Switch, Route } from 'react-router-dom';
import { hot, setConfig } from 'react-hot-loader';
import { withRouter } from 'react-router';
/* --- Components --- */
import App from './app';
import Loader from './src/shared/loader';
const Home = Loader({
loader: () =>
import('./src/components/home/homeContainer' /* webpackChunkName: 'Home' */),
});
...
const routes = props => (
<div>
<App history={props.history} />
<Switch>
<Route exact path="/" component={Home} />
<Route path="/login" render={props => <Login {...props} />} />
<Route path="/users/account" component={Users} />
<Route component={NoMatch} />
</Switch>
</div>
);
const Routes =
!module.hot || process.env.NODE_ENV === 'production'
? routes
: hot(module)(routes);
export default withRouter(Routes);
I am expecting Nav component to be re-rendered when router location changes.
react: ^16.8.6
react-dom: ^16.8.6
react-loadable: ^5.5.0
react-redux: ^6.0.0
react-router-dom: ^4.3.1
redux: ^4.0.0
connected-react-router: ^6.4.0

Answer 1

I fixed it by saving 'isLoggedIn' state in redux store. And to persist the state from redux store on page refresh, I used 'redux-persist'.
Now Nav component is re-rendering on router location change and the userName data is saved even on page refresh.
authReducer.js
const initialState = {
isLoggedIn: false,
userName: '',
};
const auth = (state = initialState, action) => {
switch (action.type) {
case types.USER_LOGIN:
return {
...state,
isLoggedIn: true,
userName: action.payload,
};
case types.USER_LOGOUT:
return {
...state,
isLoggedIn: false,
userName: '',
};
default:
return state;
}
};
nav.js
...
{this.props.isLoggedIn ? (
...
) : (
...
)}
...
const mapStateToProps = state => ({
isLoggedIn: state.auth.isLoggedIn,
userName: state.auth.userName,
});
const mapDispatchToProps = dispatch => ({
userLogout: () => dispatch(userLogout()),
});
export default withRouter(
connect(
mapStateToProps,
mapDispatchToProps,
)(Nav),
);
[ redux-persist SetUp ]
store.js
import { applyMiddleware, createStore } from 'redux';
import thunkMiddleware from 'redux-thunk';
import { createLogger } from 'redux-logger';
import { composeWithDevTools } from 'redux-devtools-extension';
import { routerMiddleware } from 'connected-react-router';
import createBrowserHistory from 'history/createBrowserHistory';
import { persistStore, persistReducer } from 'redux-persist';
import storage from 'redux-persist/lib/storage';
import createRootReducer from './src/reducers';
export const history = createBrowserHistory();
const persistConfig = {
key: 'root',
storage,
};
const persistedReducer = persistReducer(
persistConfig,
createRootReducer(history),
);
const store = createStore(
persistedReducer,
composeWithDevTools(
applyMiddleware(
routerMiddleware(history),
thunkMiddleware,
createLogger({
predicate: () => process.env.NODE_ENV === 'development',
collapsed: true,
}),
),
),
);
export const persistor = persistStore(store);
export default store;
index.js
import React from 'react';
import { render } from 'react-dom';
import { Provider } from 'react-redux';
import { ConnectedRouter as Router } from 'connected-react-router';
import { MuiThemeProvider, createMuiTheme } from '#material-ui/core/styles';
import { PersistGate } from 'redux-persist/lib/integration/react';
import store, { history, persistor } from './store';
import Routes from './routes';
import Loading from './src/shared/loading';
const theme = createMuiTheme({
palette: {
primary: { main: '#AE9A65' },
secondary: { main: '#ee9105' },
success: { main: '#43A047' },
warning: { main: '#FFA000' },
error: { main: '#ed4337' },
info: { main: '#2196F3' },
},
});
const root = document.createElement('div');
document.body.appendChild(root);
render(
<Provider store={store}>
<PersistGate loading={<Loading />} persistor={persistor}>
<MuiThemeProvider theme={theme}>
<Router history={history}>
<Routes />
</Router>
</MuiThemeProvider>
</PersistGate>
</Provider>,
root,
);